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6A4-18
1977 PONTIAC SERVICE MANUAL
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Fig. 6A4-45 Aligning Timing Marks
Fig. 6A4-46 Fuel Pump
Eccentric
3. Turn ignition switch on. Crank engine until rotor is
in line with No. 4 spark plug wire position. No. 4 piston will
be approximately at the top of cylinder.
4. Measure from pivot boss on head surface to top of No.
4 intake push-rod. Record measurement. (Fig. 6A4-47)
5. Slowly turn engine 1-1/2 revolutions until rotor
approaches No. 1 spark plug wire position. Continue to turn
engine until timing mark on crank puller is aligned with
0
on indicator. This is top dead center of No. 1 piston.
6. Again measure from pivot boss surface to top of No.
4 cylinder intake push-rod. (Fig. 6A4-47)
7. Measurement
should increase over the first
measurement as shown on chart. (Fig. 6A4-47)
8. If measurement increase is not within 1/32" of that
shown on chart, camshaft is advanced or retarded.
CAMSHAFT
Removal
1. Disconnect battery.
2. Drain radiator coolant.
3. Remove upper radiator baflle.
4. Disconnect upper radiator hose at water outlet.
5. Disconnect upper radiator hose support clamp.
6. Disconnect transmission cooler lines at radiator.
7. Remove radiator fan shroud.
8. Remove radiator.
9. Disconnect fuel line at fuel pump.
10. Remove air cleaner and disconnect throttle cable.
11. Loosen generator belt adjusting bolt, remove belt.
12. Remove generator bracket attaching bolts, move
generator to one side for access.
13. Remove power steering pump bracket attaching bolts
and remove pump, support pump to the side for access.
14. Remove air conditioning compressor mounting
bracket attaching bolts and support compressor to side for
access.
NOTE: The air conditioning lines at the compressor are
flexible and should be left attached to the compressor.
15. Disconnect thermostat bypass hose at water pump.
16. Disconnect electrical and vacuum connections.
17. Remove distributor with cap and wiring intact.
18. Remove balancer pulley.
19. Remove balancer attaching bolt.
20. Using tools as shown in Fig. 6A4-33, remove
balancer.
21. Remove engine front cover.
22. Remove both valve covers.
23. Remove intake manifold and gasket, front and rear
seal.
24. Remove rocker arms, push rods and valve lifters.
NOTE: Parts position should be noted so they will be
installed in their original position.
25. If equipped with air conditioning, discharge A/C
system remove condenser attaching bolts and remove
condenser.
26. Remove bolt securing fuel pump eccentric, remove
eccentric, camshaft gear, oil slinger and timing chain.
27. Remove camshaft by carefully sliding it out the front
of the engine.
NOTE: Do not force shaft as damage can occur to
camshaft bearings. Refer to Fig. 6A4-48 for camshaft
identification.
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